Accuracy of fitted orbital periods, based on analyses of simulated Gaia astrometric time series. The top panel shows the recovered orbital period (i.e., the median and 1σ range) vs. the true orbital period for simulated DR4 data. The bottom panel shows the same for simulated DR5 data. For the DR4 data, periods shorter than about 4 yr can be accurately recovered. For DR5, the limit is extended to about 9.5 yr.